GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
DataDome - DataDome provides innovative technology and human expertise to block bad bots.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Kasada - Kasada is a security providing platform that works with cybersecurity and threat detection, which also work towards traffic management and mitigation solution for companies and web applications.
AuthKong - A reliable captcha service, offers advanced security to protect websites from spam and abuse while ensuring a user-friendly experience for legitimate visitors.